I am building one from scratch right now. My upper and lower just shipped and this is last parts I am waiting to arrive. So here is my list of that I used.
-Matching Upper & Lower (compatible with Glock Magazines) - Quarter Circle 10 set
-Charging Handle - Raptor
-Bolt Carrier - JP 9MM Enhanced
-Trigger - Hipertouch 24C
-Safeties - BAD-ASS
-Small Parts Kit - Rainier Arms
-Stock - B5 Sopmod Enhanced for cheekweld comfort or MFT Minimalist to save weight
-Buffer Spring Set-up - JP Gen2 9MM Silent Captured Spring with 4 Tungsten Weights, AR15 White Spring and Smalley SC100-M14 Spring
-Buffer Tube - Carbine
-Barrel - JP 9mm 16 Supermatch
-Muzzle Break - Fortis 9mm
-Hand Guard - 15in Rainier Arms Force Mod 2
-Scope - Holosun 503C with SLR Absolute Cowitness Mount
-Magazines (Glock for 31 rounds) - x4
-Magazine Extension (Extension to 41 rounds) - TF +10 Extension